Formulae Rectifier Circuit
Half Wave Rectifier Circuit
Vrms = 0,707 Vpeak
formula applies only to a sinewave
Vpo = Vpsec – VD
VD is the forward voltage drop across Silicon diode taken as 0,7 V unless specified
***Vdc = 0,318 Vpo
Vpo is the peak output voltage
Vdc is the DC output voltage across load.
With Capacitive Filtering i.e a filter capacitor is used
Formula *** wont apply but the following if CAPACITIVE FILTERING is used
f = output frequency where f = 50 Hz for half wave rectifier
1
Vdc = (1 − 2fRC) Vpo
R is load resistor value also referred to as RL
Vdc = Vpo – 0,5 Vrp-p
1
Vrp − p = (fRC) Vpo
Vrp-p is the ripple voltage created by the capacitor
Full Wave Rectifier Circuit or Bi Phase Rectifier (Circuit uses 2 diodes )
Vrms = 0,707 Vpeak
Vpo = Vpsec – VD
***Vdc = 0,636 Vpo without capacitive filtering
With Capacitive Filtering
Formula *** wont apply but the following if CAPACITIVE FILTERING is used
f = output frequency where f = 100 Hz for full wave rectifier
1
Vdc = (1 − 2fRC) Vpo
Vdc = Vpo – 0,5 Vrp-p
1
Vrp − p = (fRC) Vpo
Bridge Rectifier Circuit ( 4 diodes)
Vrms = 0,707 Vpeak
Vpo = Vpsec – 2VD
***Vdc = 0,636 Vpo without capacitive filtering
Formula *** wont apply but the following if CAPACITIVE FILTERING is used
f = output frequency where f = 100 Hz for bridge rectifier circuit
1
Vdc = (1 − 2fRC) Vpo
Vdc = Vpo – 0,5 Vrp-p
1
Vrp − p = (fRC) Vpo